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Program Studi Teknik Mesin Fakultas Teknik Universitas HKBP Nommmensen Jalan Sutomo No. 4a, Medan 20234 Indonesia
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Sprocket : Journal of Mechanical Engineering
Published by Universitas HKBP Nommensen
ISSN : -     EISSN : 26858916     DOI : https://doi.org/10.36655/sproket.v1i1
Core Subject : Science, Engineering,
Automotive Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
SPROCKET Journal of Mechanical Engineering (SJoME) adalah jurnal ilmiah yang berisi tentang publikasi hasil karya penelitian, perancangan dan kajian teori di bidang ilmu teknik mesin dan permesinan, meliputi konversi energi, manufakturing, material dan perancangan desain produk. SJoME diterbitkan oleh Program Studi Teknik Mesin Fakultas Teknik, Universitas HKBP Nommensen, Medan Indonesia. SJoME terbit 2 (dua) kali dalam setahun, yaitu pada bulan Februari dan Agustus.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 92 Documents
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Analisa Pengaruh Arah Panel Surya Terhadap Daya Nugroho, Andi; Nababan, Wilson Sabastian; Setyawan, Eko Yohanes; Peranginangin, Siwan Ediamanta; Sihombing, Suriady
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 6 No 1 (2024): Edisi Agustus 2024
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v6i1.1624

Abstract

Pada penelitian ini penulis menganalisis pengaruh arah panel surya terhadap arus, tegangan, dan intensitas cahaya matahari di Kalimantan Timur dengan sudut kemiringan 25°. Penelitian ini melibatkan tiga variabel arah panel surya: timur, utara, dan barat. Data yang diperoleh melalui pengukuran langsung intensitas cahaya matahari, arus, dan tegangan yang dihasilkan oleh panel surya pada berbagai waktu dalam sehari. Hasil penelitian ini menunjukkan bahwa orientasi panel surya memiliki pengaruh signifikan terhadap efisiensi konversi energi surya. Pada arah timur dan barat menghasilkan arus dan tegangan yang lebih tinggi pada pagi dan siang hari, sedangkan dengan arah utara menghasilkan performa yang lebih stabil sepanjang hari. Temuan ini dapat menjadi referensi penting bagi pengoptimalan pemasangan panel surya di wilayah tropis seperti Kalimantan Timur.
Pengaruh Variasi Holding Time Terhadap Struktur dan Sifat Resistifitas dan Konduktifitas ZnO Dengan Doping Ni Gultom, Golfrid
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 6 No 1 (2024): Edisi Agustus 2024
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v6i1.1625

Abstract

This study aims to determine the effect of holding time variations on the structure, electrical and magnetic properties of ZnO doped with Ni. The fabrication of the samples used the solid state reaction method with a high speed shaker mill and continued with sintering at temperature of 900oC with variable holding time of 2, 4 and 8 hours. Samples doped with Ni have a hexagonal wurtzite polycrystalline structure. The holding time treatment causes a shift in the diffraction peak in the Ni-doped ZnO. This indicates a change in crystal parameters such as lattice parameters and crystal size. The crystal size of Zn0.97Ni0.03O increased with increasing holding time. The longer the holding time, the longer the diffusion that occurs from the heat effect, so that the small grains have sufficient time to combine (agglomerate) into large grains. The resistivity of Zn0.97Ni0.03O samples with holding time of 2, 4 and 8 hours was obtained increasing which caused a decrease in the conductivity value of Zn0.97Ni0.03O.
Keausan Yang Terjadi Pada Kampas Ganda Akibat Adanya Gesekan Dengan Clutch Cover (Matahari Kopling) Pada Forklift Di PT. ABC Darmadi, Herry; RAHMADI, DWI; Sidabutar, Naqasya Asyrori
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1854

Abstract

Forklift is one of the means of transportation used in PT ABC. PT ABC is the first company to produce fish oil and flour using whole fish as raw material. Wear on engine components is a problem that is often faced in industry, especially in heavy equipment such as forklifts. One component that experiences significant wear is the double clutch, which functions as a connection between the engine and transmission in the clutch system. One of the main causes of wear on the double clutch is friction that occurs with the clutch cover (clutch sun). This study aims to determine the amount of wear volume that occurs on the double clutch and to determine the amount of wear rate that occurs on the double clutch. The method used in this study is data analysis. From the results of the study, it can be concluded that the Wear Volume that occurs on the double clutch is 7.1053 x 10-4 mm3 and the Wear Rate that occurs on the double clutch is 2.13624343 x 10-18 g / sec.mm2.
Penerapan Metode Total Productive Maintenance Dan Overall Equipment Effectiveness Pada Mesin Sterilizer Di PT. Tri Cahaya Sawit Sihombing, Roy Aldo; Situmorang, Zefanya; Tampubolon, Jusra
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1861

Abstract

Machine effectiveness is a critical factor in ensuring smooth operations within the palm oil processing industry. One of the most vital machines in this process is the sterilizer, which functions to deactivate enzymes, soften fruit, and facilitate the detachment of fruit bunches. This study aims to evaluate the effectiveness level of the sterilizer machine at PT. Tri Cahaya Sawit using the Overall Equipment Effectiveness (OEE) method and to propose an improvement strategy based on Total Productive Maintenance (TPM). This research adopts a quantitative case study approach with descriptive analysis. Data were collected through direct observation, interviews, and company documentation from March to June 2024. The three OEE parameters analyzed include availability, performance, and quality rate. The results showed an average OEE value of 82.5%, with an availability rate of 92.67%, performance rate of 91.87%, and quality rate of 97.43%. These figures remain below the world-class OEE benchmark of 85%. The primary factors contributing to low effectiveness were high downtime and suboptimal maintenance scheduling. Fishbone diagram analysis revealed that the dominant causes included reactive maintenance practices, lack of operator training, and inadequate maintenance documentation. Therefore, the implementation of the eight TPM pillars—particularly autonomous maintenance and planned maintenance—is proposed to enhance the reliability and efficiency of the sterilizer machine. This study concludes that OEE serves as an effective evaluation tool to identify operational losses, and a structured TPM implementation can significantly improve machine performance and overall company productivity. Keywords: Total Productive Maintenance, Overall Equipment Effectiveness, Sterilizer Machine, Downtime, Productivity.
Perencanaan Pemeliharaan Mesin Pompa Centrifugal dengan Menggunakan Metode Reliability Centered Maintenance (RCM): Studi Kasus PT Nabati Asahan Sinaga, Septri Asri Enjelina; Sembiring, Anita Christine
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1863

Abstract

PT Multimas Nabati Asahan is one of the vegetable oil producers that experiences a high frequency of sudden breakdowns in centrifugal pump machines, averaging 12 hours per month, which negatively impacts production target achievement, operational efficiency, and increased production costs. The research methodology includes the identification of critical components, failure analysis through Failure Mode and Effect Analysis (FMEA) and Logic Tree Analysis (LTA) to determine the priority of maintenance actions. The research results show that the mechanical seal is the component with the highest RPN value of 504, followed by the rubber coupling and bearing. From the task selection results, maintenance action recommendations berupa time directed maintenance, condition based maintenance, and failure finding were obtained. The implementation of RCM is capable of reducing the frequency of sudden failures, optimizing maintenance costs, and improving the reliability and productivity of centrifugal pump machines. This research is expected to serve as a strategic reference in the machinery maintenance management system in the palm oil processing industry. Keywords: Reliability Centered Maintenance, FMEA, Logic Tree Analysis, Downtime, Centrifugal Pump Machine.
Penerapan Reliability Centered Maintenace untuk Pemeliharaan Mesin Crane di PT Pelindo Silaban, Levi; Tampubolon, Jusra Tampubolon
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1865

Abstract

This study aims to analyze the implementation of Reliability Centered Maintenance (RCM) in the maintenance of crane machines at PT Pelindo. Cranes play a vital role in port loading and unloading activities, making operational reliability essential for smooth logistics operations. The RCM approach is used to identify critical components based on potential failures, their impact on operations, and the effectiveness of maintenance actions. Data were collected through observation, interviews, documentation, and questionnaires, and analyzed using Failure Mode Effect Analysis (FMEA), Mean Time Between Failure (MTBF), Mean Time To Repair (MTTR), and Availability. The results indicate that components such as the contactor, carbon collector, and motor hoist/gearbox have the highest Risk Priority Number (RPN), requiring prioritized maintenance. The MTBF value of 317.687 hours reflects a relatively high level of machine reliability, while the MTTR of 3.25 hours demonstrates repair efficiency. The implementation of RCM has proven effective in improving reliability, reducing downtime, and minimizing maintenance costs. The study recommends enhancing preventive and predictive maintenance, as well as training technicians to efficiently detect and manage failures. Keywords: Reliability Centered Maintenance, crane, maintenance, FMEA, MTBF, MTTR
Pengaruh Penggunaan Crumb Rubber sebagai Substitusi Agregat Halus terhadap Kuat Tekan Beton Tidak Bertulang Suganda, Defri; Fahri, Tengku Muhammad; Nasution, Adinda Juwita; Ridha, Muhammad Abdhi; Hutasuhut, Syafrida Hanum
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1878

Abstract

This study aims to analyze the effect of using crumb rubber (used tire powder) as a partial substitution of fine aggregate in unreinforced concrete. especially compressive strength and concrete weight. Crumb rubber variations used were 0%, 5%, 15%, and 25% of the volume of fine aggregate. Tests were conducted on 15 cm × 30 cm cylindrical specimens treated for 28 days. The main parameters tested included compressive strength and water absorption. The results showed that the addition of crumb rubber decreased the compressive strength of concrete significantly, the highest compressive strength was obtained in normal concrete (25.8 MPa), while the mixture of 25% crumb rubber produced the lowest compressive strength (3.9 MPa). However, it provides advantages in terms of lighter specific gravity and better water absorption. However, the addition of crumb rubber reduced the weight of the concrete by 19.4%. The use of crumb rubber at 5% is considered the most optimal alternative with a decrease in compressive strength that is still within the tolerance limit for non-structural concrete. This research supports the utilization of waste tires as an effort to support sustainable development. Keywords: crumb rubber, non-reinforced concrete, waste tires, compressive strength, lightweight concrete
Besarnya Penyusutan Yang Terjadi Pada Peleburan Logam Non-Fero Dengan Menggunakan Bahan Baku 2.5 Ton Logam Untuk Pembuatan Komponen Boiler Pada Tanur Kupola Di PT. X Darmadi, Herry; Dewatmoko, Muhammad Andika; Kurnia, Dian; Bintang, Nurul Shadrina
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1932

Abstract

The casting industry is a kind of mining industry, where all industry manufacturing would never exist without the casting of the casting industry, much more difficult for the economy of a country without its own industrial role. A brushwork furnace that is one of the most popular types of metal smelting kitchens. The large shrink that occurs at smelting metals for making boiler components using 2.5 tons of raw materials is 15.08 percent or weighing 2,123 kg. the foundry in PT X using cocash-fuel (coal with high carbon levels). The process of smelting metals included sand prints that served the desired components, supplying raw materials and fuel to suit needs, smelting the kiln in my furnace with the help of blowers, pouring the molten metal into the ground, and cooling the molten metal.
Optimasi Proses Pengecoran Aluminium pada Produksi Komponen Produk Cor untuk Peningkatan Kualitas dan Efisiensi Rokhim, Nur; Sugeng, Margono
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1954

Abstract

Penelitian ini mengkaji pengaruh variasi suhu penuangan terhadap kualitas pengecoran paduan aluminium ingot AC4A dengan metode cetakan pasir CO₂. Suhu penuangan yang diuji adalah 650°C dan 664°C, dengan parameter yield dan mikrostruktur produk cor. Hasil penelitian menunjukkan bahwa peningkatan suhu penuangan berdampak positif terhadap kualitas hasil cor. Kekerasan Vickers meningkat sebesar 9,26%, dari 54,73 HV pada suhu 650°C menjadi 59,8 HV pada 664°C. Yield juga meningkat dari 10,62% menjadi 10,92%, yang menunjukkan efisiensi material yang lebih baik. Analisis mikrostruktur pada pembesaran 100x menunjukkan bahwa pengecoran pada suhu 664°C menghasilkan struktur dendritik α-Al yang lebih halus, distribusi fasa eutektik Si yang lebih merata, serta porositas yang lebih rendah. Suhu penuangan 664°C direkomendasikan sebagai parameter optimal untuk mencapai kualitas mekanis dan efisiensi produksi yang lebih baik. Temuan ini diharapkan dapat menjadi dasar pengembangan lebih lanjut proses pengecoran aluminium dalam skala laboratorium maupun pendidikan teknik.
Kajian Eksperimental Daya dan Konsumsi Bahan Bakar Mesin Pembakaran Internal dengan Bioetanol dari Sorgum sebagai Sumber Energi Terbarukan Sugiyarto, Sugiyarto; Muhammad, Rouf
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 7 No 1 (2025): Edisi Agustus 2025
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v7i1.1960

Abstract

The dependence on fossil fuels as a primary energy source has led to serious environmental and economic problems, including the scarcity of non-renewable natural resources and significant environmental impacts. There is a need to find cleaner and more sustainable renewable energy sources to reduce dependence on fossil fuels and mitigate environmental damage. One promising alternative is bioethanol from sorghum (Sorghum Bicolor). The liquid from sorghum stalks is fermented and distilled to produce bioethanol, which is then blended with gasoline (Pertamax) in various concentrations (E10, E20, and E30). A dynotest was used to measure the power output, and a measuring cup was used to test the fuel consumption of a single-cylinder gasoline engine at idle speed. Engine power and fuel consumption were the parameters analyzed. The research showed that the higher the bioethanol content in the fuel, the more fuel-efficient it became, but the higher the power output generated by the engine. The E30 blend produced the best results in terms of engine power and fuel consumption. This is due to the more uniform fuel mixture, which results in better fuel expansion. These findings support sorghum bioethanol as a sustainable alternative fuel and promote a shift towards clean energy in industry and transportation.

Page 9 of 10 | Total Record : 92

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